Improvement in blowers



`UNITED STATES ,PATENT OFFICEO H. B. BieuLo'w, oF

IMPROVEMENT IN BLOWERS.

Speciiication forming part of' Letters Patent No. 56,165, dated July 10, 1866.

do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawings constitute part of this specification, and represent, inl Figure l, a side view, looking toward the outlet; Fig. 2, an end view, and in Figs. 3 and 4. diagrams illustrating the operation of our invention. V

Our invention relates to an improvement in blowers such as are used for creating the blast for furnaces, forges, &c. 5 and it consists in the mechanism for and peculiar manner of operating the fans, whereby the movement of one is, at a certain part of its revolution, so far diminished that it serves as a stop to direct the air being advanced by the fan succeeding it from the blower, the advancing or acting fan moving through a much larger portion of a revolution than the one which acts as the stop, each fan in the same portion of its revolution serving as a stop or as acting fan, as the case may be.

To enable others skilled in the art to construct and use our improvement, we will proceed to describe the same as illustrated in the accompanying drawings.

A and A are two heads of like form. A casing, B, between them incloses a cylindrical space, as denoted in heavyblack lines in Figs. 3 and 4. Within the said cylinder we place three fans, C, D, and E, (denoted by the black radial lines in Figs. 3 and 4.) These three fans are arranged upon a central bearing, so that each moves independent of the other. This is done by placing one upon a shaft which passes through a hollow shaft on the second, which said secondhollow shaft passes through a like hollow shaft on the third, so that upon the outside of the head A levers F, G, and H may be respectively fixed to the second, third, and first fans. Outside ofthe said levers and eccentric thereto we place a wheel, I, supported in a proper bearing, K, and caused to revolve by power being applied to the pulley L. At equal distances on the wheel I we x three wristpins, a b c, in the diagram, Fig. 3, which we connect to the levers F, G, and H by pitmen d, e, and f, (see also diagram, Fig'. 3,) so that as the wheel I revolves the fans will also be caused to revolve.

In the diagrams the blue line represents the circle traversed by the wrist-pins, the broken black line the circle traversed by the levers at the point where the pitmen are connected, the fans moving with their respective levers.

In Fig. 3 the fan C is in the position as having passed the outlet, the fan Dadvancing to receive air through the inlet R, and the fan E discharging the air which it has received through the outlet S.

From the position in Fig. 3 the fans respectively advance to the position denoted in Fig. 4., where the fan D has just passed the inlet R, while the fan E has advanced and is cmpleting its discharge. The fan C serving as the stop to direct the passage ofthe air through the outlet, the movement of the fan C is now so slow that while the fan D is advancing to the position of the fan E it will only have passed to the position of fan D. At the same time the fan E will have advanced to the position of fan C, Fig. 3, and will, in its turn, be

acting as a stop to direct the air advanced by the fan D to the outlet S. Thus while the fan C has traveled slowly to the position of the fan D (see Fig. 3) the fan D will have traveled to the position of the fan E and theqfan E to the position of the fan C.

By this construction we receive by each fan a quantity of air equal to nearly two-thirds the contents of the cylinder, which large quantity at the revolution of each fan is discharged, less only the amount required to-ill the space between the fans C D, Fig. 3. We are thus enabled to obtain a strong blast at a comparatively slow velocity of the driving-pulley, the peculiar arrangement causing the acting fan to move with much greater rapidity than that of the pulley.

We have represented three fans; but nearly the same effect may be produced by the use of two fans, the one answering as the stop pass- ,l ing only over the space between the outlet and inlet, while the other is passing around to, in i its turn, act as a stop ybefore the first shall have opened the inlet. This construction Would discharge the blast in puffsthat is to say, in a more unsteady blast than with the three fans iirst described. For this reason we prefer three fans.

`We have here represented three levers with their corresponding cranks and pitmen. In this case these are required; but to those skilled in the mechanic arts it will be evident that this mechanism, together or singly, mayT be adapted to other purposes. We therefore, in claiming the mechanism by which We have attained this important improvement in blowers, do not wish to be understood as confining ourselves to the use of three, or for the particular purpose which we have described; but,

Having thus fully described our invention, what We claim as new and useful, and desire to secnre'by Letters Patent, is-

The construction and arrangement of the fans, substantially as described, to operate so that one moves With a diminished velocity through a portion of its revolution, acting as a stop for the fan succeeding it, more rapidly revolving, substantially as herein described.

H. B. BIGELOW. GEORGE MURRAY.'

Witnesses:

JOHN E. EARLE, AL'rsrE J. TIBBrrs. 

